This is a volunteer which we noticed I'd say about five years ago. Very fast grower. For perspective, the fence is six feet tall. I let it go because I was curious, and secondly it provides a good screen to our north. (A bit noisy). It bears no flowers or other goodies.
Any idea ???? TIA 

Women and cats will do as they please, and men and dogs should relax and get used to the idea-Robert A. Heinlein